High temperature deformation behavior of solid and semi-solid alloy 718
The mechanical response of alloy 718 with various microstructures in the solid and semi-solid state has been characterized. The experimental results presented for the lower temperature solid state deformation are in good agreement with published literature values and extend the experimental range to higher temperatures and lower strain rates. When dendrites were aligned along the compression axis, the directionally solidified materials exhibited an activation energy for plastic flow consistent with the activation energy for creep and self-diffusion in nickel, even at temperatures within the mushy zone. However, samples containing non-aligned grains in the semi-solid state exhibited a greater dependence of deformation with temperature; this was associated with lubricated flow of the grains due to the intergranular liquid in the mushy zone.
- Research Organization:
- Auburn Univ., AL (US)
- OSTI ID:
- 20005417
- Journal Information:
- Acta Materialia, Vol. 47, Issue 18; Other Information: PBD: 10 Dec 1999; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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